BIG SKY: DEADLY TRAILS - “Do You Love An Apple” – It’s been a few months of relative peace in Helena, but all that’s about to change when Sunny Barnes and her family set up Sunny Day Excursions just outside of town. From the moment they arrive, things begin to go awry, with Cassie being called in to investigate a missing backpacker and the new sheriff in town, Beau, partnering up with Jenny to track down a murderer on the loose. A mountainous mystery begins to unravel for Cassie Dewell and Jenny Hoyt on the season premiere of “Big Sky: Deadly Trails,” WEDNESDAY, SEPT. 21 (10:00-11:00 p.m. EDT), on ABC. (ABC/Michael Moriatis)JENSEN ACKLES

CHICAGO P.D. -- "Let it Bleed" Episode 1001 -- Pictured: (l-r) Jesse Lee Soffer as Jay Halstead, Tracy Spiridakos as Hailey Upton-- (Photo by: Lori Allen/NBC)

HOME ECONOMICS - “Mickey Ears, $19.99” – Tom finds out that Connor is his new boss, which threatens to ruin Marina’s perfectly planned trip to the Happiest Place on Earth – Disneyland Resort in California – on the season three premiere of “Home Economics,” WEDNESDAY, SEPT. 21 (9:31-10:00 p.m. EDT), on ABC. (ABC/Temma Hankin) JORDYN CURET, KARLA SOUZA, TOPHER GRACE, JECOBI SWAIN, MICKEY MOUSE, JIMMY TATRO, CHLOE JO ROUNTREE, SHILOH BEARMAN, LIDIA PORTO, CAITLIN MCGEE, SASHEER ZAMATA

ABBOTT ELEMENTARY - “Development Day” – The teachers are back at Willard R. Abbott Public School for development week, a time to prepare for the upcoming year before the students’ first day of school. Post-breakup, Janine is determined to start the year off right and leave her problems at home. With this new outlook, she takes on organizing the faculty mixer and announces a special celebrity surprise she planned for the kids’ first day. Meanwhile, Ava runs a side hustle out of the school parking lot and Gregory, now a full-time teacher, is in over his head with the curriculum when season two of “Abbott Elementary” premieres WEDNESDAY, SEPT. 21 (9:00-9:31 p.m. EDT) on ABC. (ABC/Gilles Mingasson)SHERYL LEE RALPH

CHICAGO FIRE -- "Hold on Tight" Episode 1101 -- Pictured: (l-r) Hanako Greensmith as Violet, Kara Killmer as Sylvie Brett -- (Photo by: Adrian S Burrows Sr/NBC)

THE GOLDBERGS - “If You Build It” – With everyone living back at home, the house is full of Goldberg chaos and also … Goldberg stuff, which is driving pregnant Erica bonkers and leads her to enlist Beverly’s help in clearing things out for the baby. Meanwhile, Adam and Barry are forced to share a bedroom to make room for the baby nursery. Adam can’t handle how insufferable Barry is, so he comes up with the ultimate prank to get back at him on the season premiere of “The Goldbergs,” WEDNESDAY, SEPT. 21 (8:30-9:00 p.m. EDT), on ABC. (ABC/Scott Everett White)WENDI MCLENDON-COVEY

CHICAGO MED -- "How Do You Begin to Count the Losses" Episode 801 -- Pictured: (l-r) Marlyne Barrett as Maggie Lockwood, Nick Gehlfuss as Will Halstead -- (Photo by: George Burns Jr./NBC)

THE CONNERS - “Double Honeymoon and Seeing Double” – In an effort to save money, newlyweds Darlene and Ben, and Jackie and Neville head off on their joint honeymoon, where their cost-saving measures contribute to a tension-filled getaway. Elsewhere, Dan, Becky, Harris, Mark and Beverly Rose head off for a night at a waterpark, where Harris and Mark bond in an unexpected way as Mark copes with the news that his ex-boyfriend is dating someone else on the season premiere of “The Conners,” WEDNESDAY, SEPT. 21 (8:00-8:30 p.m. EDT), on ABC. (ABC/Eric McCandless)SARA GILBERT, JAY R. FERGUSON